LEC01

Question 1

Amphipathic

Answer 1

A molecule with both hydrophilic and hydrophobic parts, for example, phospholipids.

Question 2

Passive Diffusion

Answer 2

• Very simply dissolves through the membrane.
• It does not require energy as the gradient is from a high to low concentration.
• The aim is to find equilibrium.

Question 3

Fluidity

Answer 3

Ability of phospholipids to move laterally (sideways).

Question 4

What does higher temperature mean for the fluidity?

Answer 4

More fluid due to the higher amount of kinetic energy.

Question 5

What does lower temperature mean for the fluidity?

Answer 5

More rigid.

Question 6

What does cholesterol do to the membrane?

Answer 6

Regulates the fluidity, limits it from becoming too fluid at high temperatures, or too rigid at low temperatures.

Question 7

Integral Proteins

Answer 7

A protein that can partially penetrate the cell membrane.

Question 8

Fluid Mosaic Model

Answer 8

Describes the fluid and flexible nature of the membrane.

Question 9

What are the six major functions of membrane proteins? (Just list them)

Answer 9

1. Transport (Passive and Active)
2. Enzymatic Activity
3. Signal Transduction
4. Cell-Cell Recognition
5. Intercellular Joining`